What can I check beside leaks,spark plugs,coils and connectors on 1999 Ford Expedition

Checked with a Valve Guage Tester and read Late Ingition Timing I have checked for leaks Coil on plugs good Put new spark plugs

by in El Paso, TX on April 12, 2013
1 answer 2 comments
ANSWER by on April 12, 2013
What are you checking for, tell us what the problem is!
COMMENT by on April 12, 2013
Did a tune up. Started to run with a rough idle and smoking Was not doing this before tune up Rechecked everything to make sure So checked with a gauge and it read LATE INGITION TIMING Also no codes have come out So trying to find out what has caused this It also wants to stall
COMMENT by on April 12, 2013
try dis connect battery for a few minutes. comp. should go to default. might help.

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